Could the Nationals actually be splashing some cash? Outlets were reporting earlier this week that the Nats made an offer to big-ticket free agent Mark Teixeira in the range of eight years and $160 million. By the numbers, a move for the switch-hitting first baseman makes sense — especially since the Yankees seem to be grabbing any available big-money pitcher from here to Mars. Offensively, the 2008 Nationals were at or near the bottom of…